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Test using one of Dr. Stiffler’s SEC 15 circuit setups running off a gravitylight. I still don’t have optimal tuning but it does work. Image of the inside – http://i59.tinypic.com/o7m3ox.jpg

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Short test of the output of the gravity light. On the low setting, a joule thief can be tuned to get 15 minutes of dim light per foot of drop. The weight, seems as…